> the requirement to be able to log from pretty much anywhere can lead to messy code Ah, Milewski's example of insight from the supposedly useless mathematical

> the requirement to be able to log from pretty much anywhere can lead to messy code Ah, Milewski's example of insight from the supposedly useless mathematical stuff: https://bartoszmilewski.com/2014/12/23/kleisli-categories/ https://bartoszmilewski.com/2014/12/23/kleisli-categories/ (and the corresponding lecture video).